A source said: 'This is a big money deal for Courtney. She has agreed to the film on condition that she gets to decide the main aspects of the project including director, casting, screenplay and music.

'Robert has been calling and emailing her non-stop. She has been a bit wound up by his manners, but he is her number one choice to play Kurt.

'She is adamant Scarlett will play her. Scarlett is friendly with Frances Bean, her daughter with Kurt.'

Love, 45, is apparently in talks with director David Fincher about the project, which has the working title All Apologies.